Mini Bench Center Granite Base is made of black granite base which is naturally seasoned and provide better finish and accuracy. T-slot made of steel is fixed within granite base on which two cast iron heads are mounted, both the heads can be moved to the desired positions depending upon the size of component to be checked. One of the mini bench center is spring loaded to ensure uniform pressure while holding work piece and easy loading and unloading without disturbing the accuracy of the centres. Luthra Granite mini bench centers are specially designed for checking concentrically, parallelism and true rotations of components having smaller dimensions. These are widely used in industries manufacturing smaller CNC turned automobiles parts, watch spares and microscopic parts etc. where higher accuracies are required. Centers are made from high carbon steel hardened and ground finish, having morse taper MT-1 and are replaceable.
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Standard size and accuracy of Luthra Mini Bench Centre as per IS : 5980-1978, Grade 1:
| Sizes mm | Centre Distance mm | Centre Height mm | Accuracy in (um) |
| 150 X 75 | 150 | 75 | 10 |
Cast iron heads are artificially stress relieved to avoid distortions. Granite base have outstanding advantages over cast iron base:
- Hardness uniformity.
- Accurate under load conditions.
- Vibration absorbent.
- Easy to clean.
- Rustproof ,Noncorrosive.
- Thermal stability.
- Wrap resistant.
- Low porosity.